JPH0253868B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to a magnetic head drive mechanism, and more particularly to a magnetic head drive mechanism that moves a carriage carrying a magnetic head via a belt to drive the magnetic head.

BACKGROUND OF THE INVENTION This type of magnetic head drive mechanism is widely used as a magnetic head drive mechanism of a magnetic disk device in which a magnetic head slides into contact with a magnetic disk serving as a magnetic recording medium to record and reproduce information. Its conventional structure is shown in FIGS. 1a-c and 2.

In the figure, the reference numeral 1 denotes a carriage, which is equipped with a magnetic head (not shown) and is mounted within the magnetic disk device so as to be movable in the directions of arrows A and B in FIG. 1A. One side wall 1a of the carriage 1 is formed into a substantially straight line, but both ends are formed to protrude. A pulley 2 connected to a stepping motor (not shown) serving as a driving source is arranged near the side wall 1a.

Between the pulley 2 and the carriage 1, steel belts 3a to 3c are stretched along the side wall 1a of the carriage 1, vertically spaced from each other and substantially parallel to each other. The upper and lower steel belts 3a, 3c are wound around the pulley 2, one end of which is fixed to the end of the side wall 1b adjacent to the side wall 1a via a mounting screw 4, and the other end is mounted on the circumferential surface of the pulley 2. It is fixed via screws 5. One end of a rectangular plate spring 6 having a straight base and an arcuate tip is fixed to the mounting screw 4, and the steel belts 3a and 3c are wound around this plate spring 6. It is strung up. The steel belts 3a and 3c are attached to the side wall 1 by tension due to the urging force of the leaf spring 6.
It is pulled in a straight line along a. The steel belt 3b in the middle is also wound around the pulley 2, and on this pulley the steel belts 3a, which are branched,
It is integrated with 3c. The steel belt 3b is attached to the mounting screw 5 of the pulley 2 and the side wall 1a.
It is stretched between a mounting screw 7 fixed to one end of the frame. Here, the tension of the steel belts 3a, 3c due to the biasing force of the leaf spring 6 is applied to the steel belt 3b via the pulley 2, whereby the steel belt 3b is pulled in a straight line.

When the magnetic head is driven, the pulley 2 is rotated clockwise or counterclockwise in FIG. 1A by driving a stepping motor (not shown). When rotated clockwise, the steel belt 3b is wound around the pulley 2, and the branched steel belts 3a and 3c are unwound, so that the carriage 1 is pulled and moved in the direction of arrow A. When the belt rotates counterclockwise, the branched steel belts 3a and 3c are wound around the pulley 2, and as the steel belt 3b is unwound, the carriage 1 is pulled and moved in the direction of arrow B. As the carriage 1 moves, a magnetic head (not shown) is transferred in the direction of arrow A or arrow B.

In the above configuration, the steel belts 3a, 3 are branched by the biasing force of the curved leaf spring 6.
The steel belt 3b is pulled through the pulley 2 and the pulley 2. As a result, the steel belts 3a and 3c are stretched in a straight line without any slack. This is because if there is slack in either of the branched steel belts 3a and 3c, the positioning accuracy will be disrupted and play will occur when the carriage 1 is driven, and unreasonable force will be applied to the steel belt 3a or 3c that is not slack. Tame steel belt 3
This is to prevent the lifespan of parts a to 3c from being shortened.

The slack in the steel belts 3a to 3c is caused by causes such as impact when the stepping motor is driven, impact when the belt is reversed, or expansion and contraction of each member due to temperature fluctuations. In addition, a branched steel belt 3 is wound around a leaf spring 6 and stretched substantially parallel.
The magnitude of the non-uniform slack amount of the belts a and 3c varies depending on variations in component precision, deviations in the mounting position precision of the leaf spring 6, and the degree of winding of the steel belts 3a and 3c around the pulley 2.

However, in the above conventional configuration, the two branched steel belts 3a, 3c are pulled together by a single plate-shaped leaf spring 6, and the pulling force is the same, so the steel belts 3a, 3c are If there is a difference in the amount of slack, the leaf spring 6 absorbs the smaller slack and does not absorb the larger slack.

Therefore, in the conventional configuration, the slack dimensions of the two branched steel belts must be equalized with high precision, which requires high component precision and high mounting position precision, which requires a large amount of assembly man-hours. The drawback was that it was costly.

Purpose The present invention was made in view of the above drawbacks.
An object of the present invention is to provide a magnetic head drive mechanism of the type mentioned at the beginning, which has a simple and inexpensive construction and can provide high positioning accuracy when driving the magnetic head.

Embodiments The present invention will be described in detail below based on embodiments shown in the drawings. 3a and 3b and FIG. 4 show the construction of the embodiment, and the same parts as in FIGS. 1a to 1c and 2 are designated by the same reference numerals, and the explanation thereof will be omitted.

As shown in the figure, the configuration of this embodiment is almost the same as the conventional configuration described above, but steel belts 3a and 3c
The configuration of the leaf spring 6' for tensioning is different from the conventional configuration.

The leaf spring 6' is a single rectangular leaf spring with a straight base and an arcuate tip, but the curved part has an elongated cutout approximately in the center.
The curved portion is bifurcated into two curved portions 6'a and 6'b. And the leaf spring 6' is the carriage 1
The base is fixed by a mounting screw by engaging with a protrusion at the end of the side wall 1b, and a steel belt 3a is wound and stretched around one curved part 6'a.
A steel belt 3c is wound and stretched around the other curved portion 6'b. i.e. steel belt 3
a is pulled separately by the urging force of the curved portion 6'a, and the steel belt 3c is pulled by the urging force of the curved portion 6'b.

In this embodiment, as described above, the two branched steel belts 3a and 3c are each pulled separately, so even if the steel belts 3a and 3c have different amounts of slack when driving the magnetic head,
The steel belts 3a and 3c are stretched separately at each portion of the leaf spring 6' in accordance with the amount of slack in each, and the slack in both is absorbed.

That is, according to this embodiment, the steel belt 3
Even if the amount of slack in a and 3c is different, the slack in both is absorbed. In other words, it is not the case that the slack on one side is not absorbed as in the conventional case. Therefore, it is no longer necessary to equalize the amount of slack in the steel belts 3a and 3c with high precision.

In the above embodiment, the plate spring 6' that tensions the steel belts 3a to 3c is integrated, but it is of course possible to use two separate plate springs. Further, the means for tensioning the steel belts 3a to 3c is not limited to the plate spring, but may be constructed from other elastic members.

Effects As is clear from the above explanation, in the magnetic head drive mechanism according to the present invention, there is a gap between the pulley connected to the drive motor and the carriage of the magnetic head.
We have adopted a configuration in which a belt with multiple branches is stretched while being individually tensioned, and the carriage is moved through the belt by the rotation of a pulley, so that the belt with multiple branches is not uneven when driving the magnetic head. If the belt slackens in the belt, the slack in the plurality of belts is absorbed individually. Therefore, it is no longer necessary to equalize the amount of slack between the branched belts with high precision, and it is possible to lower standards for component accuracy and mounting position accuracy than before.
It is possible to provide a magnetic head drive mechanism that achieves high positioning accuracy when driving a magnetic head with a simple and inexpensive configuration.

[Brief explanation of drawings]

Figures 1a to 1c are a plan view, a front view, and a side view of the main parts of a conventional magnetic head drive mechanism, respectively;
The figure is a perspective view of a part of a conventional magnetic head drive mechanism.
3a and 3b are a front view and a side view, respectively, of essential parts of a magnetic head drive mechanism according to the present invention, and FIG. 4 is a perspective view of a portion of the magnetic head drive mechanism according to the present invention. 1...Carriage, 2...Pulley, 3a to 3c
...Steel belt, 6'...Plate spring, 6'a,
6'b...Curved part.

Claims (1)

[Claims] 1. A plurality of branched belts are stretched under tension between a carriage equipped with a magnetic head and a pulley connected to a drive source, and the carriage is moved via the belt by the rotational drive of the pulley. A magnetic head drive mechanism, characterized in that the magnetic head drive mechanism is configured to individually pull the plurality of branched belts.